Elevator apparatus



(No Model.) 2 Sheets- Sheet l. H. W. PORSLUND & J. E. DORMAN.

BLEVATOR APPARATUS.

No. 531,792. Patented Jan. l. 1895.

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(No Model.) 2 Sheets-Sheet 2.

H. W. FORSLUND & J. E. DGRMAN. ELEVATUR APPARATUS.

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IIUGO XV. FORSLUN D AND JOHN E. DOMAN, OF CHICAGO, ILLINOIS.

ELEVATOR APPARATUS.

SPECIFICATION forming part of Letters Patent No. 531,792, dated January 1, 1895.

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Be it known that we, HUGO W. FORSLUND and JOHN E. DORMAN, the former a citizen of the United States and the latter a subject of the Queen of Great Britaimboth residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Elevator Apparatus, of which the following is a specication.

This invention relates to hydraulic elevators, and its objects are to remedy difliculties and avoid defects found to exist in elevator apparatus, as heretofore constructed, to increase the efficiency of the same and to effect a more reliable and positive operation of the same.

lVith these objects in View the invention consists in the construction, combinations, location and relative arrangements of parts as will be more fully hereinafter described, as shown in the accompanying drawings, and iinally pointed out in the appended claims.

In the drawings, Figure 1 illustrates in central longitudinal section, parts being broken away, a hydraulic elevator motor embodying one form of apparatus for carrying out the principles of our invention. Fig. 2 is a similar view embodying anotherl form. Fig. 8 is a similar view embodying still another form.

To enable others skilled in the art to make and use our invention, we will now explain fully the principle thereof and the forms of apparatus shown for applying that principle.

Reference is had to the accompanying drawings, forming a part hereof and to the various views and reference signs appearing thereon, and wherein* Reference sign 1, designates a iiuid motor cylinder which may be of any suitable or well known form. In the drawings a well known type of upright or verticalfluid motor cylinder is shown, as such type is particularly well adapted for hydraulic elevator constructions, but it will be readily seen and understood that our invention maybe applied to any other type of motor to which it is adapted. The piston is represented generally by the numeral 2. The fluid supply and outlet pipes 3, 4, valve 5, and valve controlling mechanism 6, may be of any well known and suitable construction. Carried by, or cast solidly with 'screw threaded end thereof, on the opposite side of the piston, is a centrally bored, elongated, cuneiform block or plunger 1l, capable of adjustment on said rod by means oi the set nut 12. This block is adapted to be received in a cylindrical chamber 13, formedin the cylinder head, at the opposite end thereof from the end above described, where chamber S,islocated. The end of plunger block 11, adjacent to the piston may be hanged, as shown at 14, to adapt it to enterachamber 15, formed in the face of the piston, suicient space being allowed for the free passage of the fluid around the iiange, as clearly shown. The cylinder ports 16, 17, are of the usual construction and anysuitable pipe connection 18, maybe employed to aiford communication between the two. Suitable passages 19, are provided, see Figs. l and 3, which open constant and free communication between chamber S, and the source of fluid supply, or, asin Fig. 2, the chamber 8, may be supplied with fluid from the tank or other source by means of a connection 20, disconnected from and independent of the main supply pipe 3.

In the form of apparatus shown in Fig. 1,l for carrying out the principles of our invens tion, plunger 7, is shown as a solid, centrally bored, cuneiforn1block,and may be, if desired cast solidly with the piston. Chamber 8, is shown cylindrical in shape. lVhen the piston approaches its limit of stroke, that is when the elevator car reaches one limit of its travel, say the bottom of the shaft, cuneiorm plunger block 7, enters the chamber 8, which, being in constant communication with the main huid supply pipe, is filled with fluid. As plunger 7, advances in chamber 8, the fluid contained therein is displaced, forced out, escaping therefrom through the space between the outer surface of said plunger and the inner wall ofi-said chamber. By reason of the tapering or cuneiform shape of the plunf Y f/ rentree Without jar.

In the form shown in Fig. 2, the plunger block '7, is made cylindrical in shape, and chamber 8, is made tapering. In this construction said chamber is isolated from the main fluid supply of the cylinder, and receives its supply of fluid from the tank or other source through supply pipe 20. A suitable packing 2l, serves to isolate said chamber from the main cylinder fluid supply.

By adjustably mounting plunger block l1,

on the end 10, of piston rod 9, the limit of stroke of the piston may be adjusted. In order to avoid the objection usually present in constructions of this kind of having the car start off slowly at the beginning of its ascent or descent due to the fact that only a small or limited surface area of the piston is presented to the action of the fluid at the moment of starting the car, We provide passages 19, through Which the fluid may freely pass and thus reach a large area of piston.

It will be observed that by the action of our hydraulic buffer, depending as it does on displacement, instead of compression, and not affecting the supply of Huid to the cylinder, as by Wholly or partially cutting off said supply, as is usually the case, the objection is avoided of increasing theresistance to the discharge of the fluid from the-main cylinder auf iin adapted to enter said chamber at the limit of stroke of said piston, the interior Walls of said chamber and the exterior surface of said plunger being inclined relative to each other, whereby said plunger eects a displacement of the fluid contained in said chamber against a gradually increasing resistance Without affecting the supply or exhaust of duid to or from the motor cylinder; as and for the purpose set forth.

2. In an apparatus of the class described a fluid motor cylinder, having supply and eX- haust ports, a piston, a plunger carried thereby, a chamber adapted to receive said plunger, said chamber being in constant communication with a source of fluid supply,but removed from and independent of said supply and exhaust ports, the inner Walls of said chamber and said plunger being conical with respect to each other; as and for the purpose set forth.

3. In an elevator apparatus a motor cylinder, provided with the usual supply and exhaust ports, av piston, a plunger carried on each side of said piston, a chamber arranged adjacent to each end of the motor cylinder, said chambers being in constant communication with a source of fluid supply but removed from and independent of said supply and exhaust ports, one of said chambers adapted to y said; pistemand receive a plunger at each limit of stroke of said piston, whereby the movement of the n piston is arrested without jar, and Without affecting the supply or exhaust of the duid to or from the motor cylinder; as and for the purpose set forth.

4. In an elevator apparatus a cylinder provided with the usual supply and exhaust ports, a piston au adjustable plunger carried by said piston,a chamber arranged adjacent to the cylinder head removed from and independent of the supply and exhaust ports, said chamber being in constant communication with a source of duid supply, said plunger arranged to enter said chamber at the limit of stroke of said piston, said chamber and piston being conical with relation to each other, whereby said plunger effects a displacement of the duid contained in said chamber, as it advances therein, against a gradually increasing resistance without affecting the supply or exhaust of duid to or from the motor cylinder; as and for the purpose set forth.

5. In ahyd raulic elevator apparatus, a duid motor cylinder provided with s/upply and exhaust ports,a pistou, a plunger carried by said piston, a chamber arranged adjacent to the end of the cylinder removed from and independent of the exhaust or supply ports, but adapted to receive a constant fluid supply and having air passages or ducts, as described, said plunger adapted to be received in said chamber when the piston approaches the limit of its stroke; as and for the purpose set forth.

6. In a hydraulic elevator a duid motor cylinder provided with supply and exhaust ports, a piston, a cone-shaped plunger carried by said piston, a cylindrical chamber arranged adjacent to the endv of the cylinder, removed from andindependent of the exhaust or supply ports and in constant communication with a source of duid supply, said plunger adapted to be received in said chamber as the piston approaches its limit of stroke, whereby the duid contained therein is displaced against a constantly increasing resistance, and VWithout interfering with or throttling the duid supply to the motor cylinder; as and for the purpose set forth.

7. In a hydraulic elevator apparatus, a duid motor cylinder provided with the usual supply and exhaust ports, a piston, a tapering plunger carried thereby, a cylindrical chamber arranged at the end of said cylinder, removed from and independent of the supply or exhaust ports, and in free communication with a constant source of duid supply, said chamber provided with air passages at the outer extremity thereof, said plunger adapted to enter said chamber as the piston approaches the limit of its stroke, whereby the duid contained in said chamber is displaced against a gradually increasing resistance Without affecting or interfering with the supply or exhaust of the duid to or from the motor cylinder; as and for the purpose set forth.

In testimony whereof We have hereunto set our hands, this the 14th day of April, 1894;, in the presence of two subscribing Witnesses.

HUGO W. FORSLUND. JOHN E. DORMAN.

Vitnesses:

G. T. FRANCIS, B. F. Russ. 

